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Other Non-Current Assets - Summary of Other Non-Current Assets (Parenthetical) (Details) - CNY (¥) ¥ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Nov. 30, 2018
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Other Non Current Assets [Line Items] |  |  |  |
Prepayment to acquire a building | [1] | ¥ 404,725 | ¥ 404,725 |
Mortgage Loan | PRC Bank |  |  |  |
Other Non Current Assets [Line Items] |  |  |  |
Prepayment to acquire a building |  |  |  | ¥ 200,000
[1] | The amount represented the prepayment for a building (Building D) in Wuhan and the building remained under construction by the real estate developer as of December 31, 2019. RMB200,000 of the prepayment was made through a mortgage loan provided by a PRC bank in November 2018 (Note 12).

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- Definition Sum of the carrying amounts as of the balance sheet date of amounts paid in advance for expenses which will be charged against earnings in periods after one year or beyond the operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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